Describe the bug

The Progressbar component in the Svelte version doesn't update correctly. This is because the style applied to the element has an incorrect syntax

The style prop passed to the span has to be a string, not a JavaScript object

To Reproduce

Steps to reproduce the behavior:

1. Instantiate Progressbar
2. Set progress to a number

Expected behavior

Bar should display progress value

Actual Behavior

There is no progress update. In the devtools the style has become [object Object]

<span class="progressbar" data-progress="20"><span style="[object Object]"></span></span>